%%%%%%%%%%%%%%%%%%%%%%
%% start of file `elegantbook.cls'.
%% Copyright 2013-2020 ElegantLaTeX (elegantlatex2e@gmail.com)
%%
%% This work may be distributed and/or modified freely
%% available at https://github.com/ElegantLaTeX/ElegantBook
% 
%%%%%%%%%%%%%%%%%%%%%
% % !Mode:: "TeX:UTF-8"
\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{elegantbook}[2020/08/04 v4.0.5 ElegantBook document class]

\RequirePackage{kvoptions}
\RequirePackage{etoolbox}
\SetupKeyvalOptions{family=ELEGANT, prefix=ELEGANT@, setkeys=\kvsetkeys}
\newcommand{\ekv}[1]{\kvsetkeys{ELEGANT}{#1}}

% ----- Colors -----
\DeclareStringOption[blue]{color}
\DeclareStringOption[en]{lang}
\DeclareStringOption[answer]{result}
\DeclareStringOption[fancy]{mode}
\DeclareStringOption[normal]{device}
\DeclareStringOption[cm]{math}
\DeclareStringOption[marginfalse]{marginpar}
\DeclareStringOption[onecol]{toc}
\DeclareStringOption{scheme}
% ----- backward compatibility
\DeclareVoidOption{green}{\ekv{color=green}}
\DeclareVoidOption{cyan}{\ekv{color=cyan}}
\DeclareVoidOption{blue}{\ekv{color=blue}}
\DeclareVoidOption{gray}{\ekv{color=gray}}
\DeclareVoidOption{black}{\ekv{color=black}}
\DeclareVoidOption{nocolor}{\ekv{color=none}}
\DeclareStringOption[ctexfont]{chinesefont}

\DeclareVoidOption{chinese}{\ekv{scheme=chinese}}

\DeclareVoidOption{ctexfont}{\ekv{chinesefont=ctexfont}}
\DeclareVoidOption{founder}{\ekv{chinesefont=founder}}
\DeclareVoidOption{nofont}{\ekv{chinesefont=nofont}}

\DeclareVoidOption{en}{\ekv{lang=en}}
\DeclareVoidOption{cn}{\ekv{lang=cn}}
\DeclareVoidOption{it}{\ekv{lang=it}}

\DeclareVoidOption{fancy}{\ekv{mode=fancy}}
\DeclareVoidOption{simple}{\ekv{mode=simple}}

\DeclareVoidOption{answer}{\ekv{result=answer}}
\DeclareVoidOption{noanswer}{\ekv{result=noanswer}}

\DeclareVoidOption{normal}{\ekv{device=normal}}
\DeclareVoidOption{pad}{\ekv{device=pad}}
\DeclareVoidOption{phone}{\ekv{device=phone}}

\DeclareVoidOption{newtx}{\ekv{math=newtx}}
\DeclareVoidOption{mtpro2}{\ekv{math=mtpro2}}
\DeclareVoidOption{cm}{\ekv{math=cm}}

\DeclareVoidOption{margintrue}{\ekv{marginpar=margintrue}}
\DeclareVoidOption{marginfalse}{\ekv{marginpar=marginfalse}}


\DeclareVoidOption{onecol}{\ekv{toc=onecol}}
\DeclareVoidOption{twocol}{\ekv{toc=twocol}}


% ----- Math option -----
\newcommand\mailto[1]{\href{mailto:#1}{\nolinkurl{#1}}}

% ----- Title Style -----
\DeclareStringOption[hang]{titlestyle}[hang]
% ----- backward compatibility
\DeclareVoidOption{hang}{\ekv{titlestyle=hang}}
\DeclareVoidOption{display}{\ekv{titlestyle=display}}
% ----- Default Options -----
\DeclareDefaultOption{\PassOptionsToClass{\CurrentOption}{book}}

\ProcessKeyvalOptions*\relax
% \ProcessOptions*\relax
\LoadClass[a4paper,oneside]{book}

\RequirePackage{setspace}

\RequirePackage{csquotes}


\RequirePackage{hyperref}
\hypersetup{
  breaklinks,
  unicode,
  linktoc=all,
  bookmarksnumbered=true,
  bookmarksopen=true,
  pdfkeywords={ElegantBook},
  colorlinks,
  linkcolor=winered,
  citecolor=winered,
  urlcolor=winered,
  plainpages=false,
  pdfstartview=FitH,
  pdfborder={0 0 0},
  linktocpage
}

%% device settings
\RequirePackage{geometry}
\ifdefstring{\ELEGANT@device}{normal}{
  \geometry{
    a4paper,
    top=25.4mm, bottom=25.4mm,
    left=20mm, right=20mm,
    headheight=2.17cm,
    headsep=4mm,
    footskip=12mm
  }
  \ifdefstring{\ELEGANT@marginpar}{margintrue}{
    \geometry{
      marginparwidth=5cm, marginparsep=5mm,
      left=2cm,right=7cm}}{\relax}}{
    \relax}

\ifdefstring{\ELEGANT@device}{pad}{
\geometry{
  paperwidth=7.5in, 
  paperheight=10in,
  margin=16mm,
  headheight=2.17cm,
  footskip=4mm
}}{\relax}

\ifdefstring{\ELEGANT@device}{phone}{
\geometry{
  % a5paper,
  % margin=14mm,
  hmargin=6mm,
  vmargin=3mm,
  % paperwidth=4.43in,
  % paperheight=3.31in,
  % 16:11
  % paperwidth=4.92in,
  % paperheight=3.38in,
  % 16:10
  % paperwidth=4.92in,
  % paperheight=3.08in,
  % Kindle size 4:3
  paperwidth=4.92in,
  paperheight=3.68in,
  % paperwidth=5.42in,
  % paperheight=4.08in,
  % paperwidth=6.40in,
  % paperheight=4.78in,
  % headheight=2mm,
  % footskip=0mm
}}{\relax}

\RequirePackage{indentfirst,comment}
% fontsetting
\ifdefstring{\ELEGANT@math}{mtpro2}{
  \let\Bbbk\relax
  \RequirePackage[lite]{mtpro2}
}{\relax}

\setcounter{tocdepth}{1}
\renewcommand{\baselinestretch}{1.2}

\PassOptionsToPackage{no-math}{fontspec}
\RequirePackage{iftex}
\ifdefstring{\ELEGANT@lang}{cn}{
  \ifXeTeX
    \ifdefstring{\ELEGANT@chinesefont}{founder}{
      \RequirePackage[UTF8,scheme=plain,fontset=none]{ctex}
      \setCJKmainfont[BoldFont={FZHei-B01},ItalicFont={FZKai-Z03}]{FZShuSong-Z01}
      \setCJKsansfont[BoldFont={FZHei-B01},ItalicFont={FZHei-B01}]{FZHei-B01}
      \setCJKmonofont[BoldFont={FZHei-B01},ItalicFont={FZHei-B01}]{FZFangSong-Z02}
      \setCJKfamilyfont{zhsong}{FZShuSong-Z01}
      \setCJKfamilyfont{zhhei}{FZHei-B01}
      \setCJKfamilyfont{zhkai}{FZKai-Z03}
      \setCJKfamilyfont{zhfs}{FZFangSong-Z02}
      \newcommand*{\songti}{\CJKfamily{zhsong}}
      \newcommand*{\heiti}{\CJKfamily{zhhei}}
      \newcommand*{\kaishu}{\CJKfamily{zhkai}}
      \newcommand*{\fangsong}{\CJKfamily{zhfs}}}{\relax}
    
    \ifdefstring{\ELEGANT@chinesefont}{nofont}{
      \RequirePackage[UTF8,scheme=plain,fontset=none]{ctex}}{\relax}

    \ifdefstring{\ELEGANT@chinesefont}{ctexfont}{
      \RequirePackage[UTF8,scheme=plain]{ctex}}{\relax}
  \else
    \ifdefstring{\ELEGANT@chinesefont}{ctexfont}{
      \RequirePackage[UTF8,scheme=plain]{ctex}}{\relax}
  \fi
  \AfterEndPreamble{
    % \renewcommand{\itshape}{\kaishu}
    \setlength\parindent{2\ccwd}}
}{\relax}


\ifcsname kaishu\endcsname
  \newcommand{\citshape}{\kaishu}
\else
  \newcommand{\citshape}{\itshape}
\fi
\ifcsname kaishu\endcsname
  \newcommand{\cnormal}{\kaishu}
\else
  \newcommand{\cnormal}{\normalfont}
\fi

\ifcsname fangsong\endcsname
  \newcommand{\cfs}{\fangsong}
\else
  \newcommand{\cfs}{\normalfont}
\fi


\usepackage{fontspec}
\setmainfont{TeX Gyre TermesX}
\setsansfont{TeX Gyre Heros}
\setmonofont{Latin Modern Mono}

% Libertinus Serif/Libertinus Sans

% TeX Gyre TermesX/TeX Gyre Heros

\defaultfontfeatures[TeX Gyre TermesX,TeX Gyre Heros]{
  Extension      = .otf,
  UprightFont    = *-regular,
  BoldFont       = *-bold,
  ItalicFont     = *-italic,
  BoldItalicFont = *-bolditalic
}
\defaultfontfeatures[Latin Modern Mono]{
  Extension      = .otf,
  UprightFont    = *-regular,
  BoldFont       = *-bold,
  ItalicFont     = *-oblique,
  BoldItalicFont = *-boldoblique
}

\RequirePackage{anyfontsize}
\ifdefstring{\ELEGANT@math}{newtx}{
  \RequirePackage{newtxmath}
  \let\Bbbk\relax
  \RequirePackage{esint}
  %%% use yhmath pkg, uncomment following code
  % \let\oldwidering\widering
  % \let\widering\undefined
  % \RequirePackage{yhmath}
  % \let\widering\oldwidering

  %%% use esvect pkg, uncomment following code
  % \RequirePackage{esvect}

  \DeclareSymbolFont{CMlargesymbols}{OMX}{cmex}{m}{n}
  \let\sumop\relax\let\prodop\relax
  \DeclareMathSymbol{\sumop}{\mathop}{CMlargesymbols}{"50}
  \DeclareMathSymbol{\prodop}{\mathop}{CMlargesymbols}{"51}
}{\relax}

% ----- Handle Colors -----
%% 章节以及页脚图形

\RequirePackage[table]{xcolor}
\ifdefstring{\ELEGANT@color}{green}{
  \definecolor{structurecolor}{RGB}{0,120,2}%
  \definecolor{main}{RGB}{0,120,2}%
  \definecolor{second}{RGB}{230,90,7}%
  \definecolor{third}{RGB}{0,160,152}%
}{\relax}
\ifdefstring{\ELEGANT@color}{cyan}{
  \definecolor{structurecolor}{RGB}{31,186,190}%
  \definecolor{main}{RGB}{59,180,5}%
  \definecolor{second}{RGB}{175,153,8}%
  \definecolor{third}{RGB}{244,105,102}%
}{\relax}
\ifdefstring{\ELEGANT@color}{blue}{
  \definecolor{structurecolor}{RGB}{60,113,183}
  \definecolor{main}{RGB}{0,166,82}%
  \definecolor{second}{RGB}{255,134,24}%
  \definecolor{third}{RGB}{0,174,247}%
}{\relax}
\ifdefstring{\ELEGANT@color}{gray}{
  \definecolor{structurecolor}{RGB}{150,150,150}
  \definecolor{main}{RGB}{150,150,150}%
  \definecolor{second}{RGB}{150,150,150}%
  \definecolor{third}{RGB}{150,150,150}%
}{\relax}
\ifdefstring{\ELEGANT@color}{black}{
  \definecolor{structurecolor}{RGB}{0,0,0}
  \definecolor{main}{RGB}{0,0,0}%
  \definecolor{second}{RGB}{0,0,0}%
  \definecolor{third}{RGB}{0,0,0}%
}{\relax}

%green color
\definecolor{structure1}{RGB}{0,120,2}%
\definecolor{main1}{RGB}{0,120,2}%
\definecolor{second1}{RGB}{230,90,7}%
\definecolor{third1}{RGB}{0,160,152}%
%cyan color
\definecolor{structure2}{RGB}{31,186,190}%
\definecolor{main2}{RGB}{59,180,5}%
\definecolor{second2}{RGB}{175,153,8}%
\definecolor{third2}{RGB}{244,105,102}%
%blue color
\definecolor{structure3}{RGB}{60,113,183}
\definecolor{main3}{RGB}{0,166,82}%
\definecolor{second3}{RGB}{255,134,24}%
\definecolor{third3}{RGB}{0,174,247}%
% gray color
\definecolor{structure4}{RGB}{150,150,150}
\definecolor{main4}{RGB}{150,150,150}%
\definecolor{second4}{RGB}{150,150,150}%
\definecolor{third4}{RGB}{150,150,150}%
% black color
\definecolor{structure5}{RGB}{0,0,0}
\definecolor{main5}{RGB}{0,0,0}%
\definecolor{second5}{RGB}{0,0,0}%
\definecolor{third5}{RGB}{0,0,0}%

% corlor definition
\definecolor{winered}{rgb}{0.5,0,0}
\definecolor{bule}{RGB}{18,29,57}

% ----- Title Style -----
\ifdefstring{\ELEGANT@titlestyle}{hang}{\def\style{hang}}{\relax}
\ifdefstring{\ELEGANT@titlestyle}{display}{\def\style{display}}{\relax}

% reference: 
% https://tex.stackexchange.com/questions/58506/how-to-make-a-new-command-similar-to-author
% https://pastebin.com/C8W4axzV
\newcommand\email[1]{\href{mailto:#1}{\nolinkurl{#1}}}

\global\let\@title\@empty
\global\let\@author\@empty
\global\let\@date\@empty
\newcommand{\subtitle}[1]{\gdef\@subtitle{#1}}
\newcommand{\institute}[1]{\gdef\@institute{#1}}
\newcommand{\version}[1]{\gdef\@version{#1}}
\newcommand{\extrainfo}[1]{\gdef\@extrainfo{#1}}

\RequirePackage{mwe}
\newcommand{\logo}[1]{\gdef\@logo{#1}}
\newcommand{\cover}[1]{\gdef\@cover{#1}}

\newcommand{\question}[1]{{\par\citshape #1}\\[0.2ex]}

\RequirePackage{enumerate}
% list/itemize/enumerate setting
\RequirePackage[shortlabels,inline]{enumitem}
\setlist{nolistsep}

\RequirePackage[font=small,labelfont={bf,color=structurecolor}]{caption} 
\captionsetup[table]{skip=3pt}
\captionsetup[figure]{skip=3pt}

\AtBeginDocument{
  \setlength{\abovedisplayskip}{3pt}
  \setlength{\belowdisplayskip}{3pt}
  \RequirePackage[flushmargin,stable]{footmisc}
  \setlength{\footnotesep}{12pt}
}



\RequirePackage{graphicx}
%\RequirePackage{enumerate}
\RequirePackage{amsmath,mathrsfs,amsfonts,amssymb}
% \providecommand\qed{}
% \renewcommand{\qed}{\hfill\ensuremath{\square}}
\RequirePackage{booktabs}
\RequirePackage{multicol,multirow}

\RequirePackage{fancyvrb}
\RequirePackage{makecell,lipsum,hologo}
%%中文结构名字

\ifdefstring{\ELEGANT@lang}{cn}{
  \RequirePackage[
    backend=biber,
    style=gb7714-2015,
    sorting=gb7714-2015]{biblatex}}{
  \RequirePackage[
    backend=biber,
    style=numeric-comp,
    sorting=none]{biblatex}
}

\ifdefstring{\ELEGANT@lang}{cn}{
  \renewcommand{\baselinestretch}{1.3}
  \renewcommand{\contentsname}{目录}
  \renewcommand{\figurename}{图}
  \renewcommand{\tablename}{表}
  \renewcommand{\partname}{\color{structurecolor}}
  \renewcommand{\thepart}{第\zhnumber{\arabic{part}}部分}
  \renewcommand{\listfigurename}{插图目录}
  \renewcommand{\listtablename}{表格目录}
  \renewcommand{\bibname}{参考文献}
  \renewcommand{\appendixname}{附录~\thechapter\;}
  \renewcommand{\indexname}{索\hspace{2em}引}
  \newcommand\figref[1]{\textbf{图}~\ref{#1}}
  \newcommand\tabref[1]{\textbf{表}~\ref{#1}}
  \ifdefstring{\ELEGANT@scheme}{chinese}{
    \renewcommand{\chaptername}{第\zhnumber{\arabic{chapter}}章}}{
    \renewcommand{\chaptername}{第 \thechapter{} 章}}
  \newcommand{\authorname}{\citshape 作者：}
  \newcommand{\institutename}{\citshape 组织：}
  \newcommand{\datename}{\citshape 时间：}
  \newcommand{\versionname}{\citshape 版本：}
  \newcommand{\notename}{笔记}
  \renewcommand*{\proofname}{证明}
  \newcommand{\definitionname}{定义}
  \newcommand{\theoremname}{定理}
  \newcommand{\axiomname}{公理}
  \newcommand{\postulatename}{公设}
  \newcommand{\lemmaname}{引理}
  \newcommand{\propositionname}{命题}
  \newcommand{\corollaryname}{推论}
  \newcommand{\examplename}{例题} %
  \newcommand{\instancename}{示例} %
  \newcommand{\problemname}{问题} % 问题
  \newcommand{\exercisename}{练习} % 练习=习题
  \newcommand{\remarkname}{注}
  \newcommand{\hintname}{提示}
  \newcommand{\assumptionname}{假设}
  \newcommand{\conclusionname}{结论}
  \newcommand{\solutionname}{解}
  \newcommand{\propertyname}{性质}
  \newcommand{\introductionname}{内容提要}
  \newcommand\bioinfo[2]{\gdef\@bioinfo{{\citshape #1}：#2}}
  \newcommand{\updatename}{更新：}
  \newcommand{\historyname}{版本更新历史}
  }{\relax}
\ifdefstring{\ELEGANT@lang}{en}{
  \setlength\parindent{2em}
  \newcommand\figref[1]{\textbf{Figure}~\ref{#1}}
  \newcommand\tabref[1]{\textbf{Table}~\ref{#1}}
  \newcommand{\authorname}{\textbf{Author: }}
  \newcommand{\institutename}{\textbf{Institute: }}
  \newcommand{\datename}{\textbf{Date: }}
  \newcommand{\versionname}{\textbf{Version: }}
  \newcommand{\notename}{Note}
  \newcommand{\proofname}{Proof}
  \newcommand{\problemname}{Problem}
  \newcommand{\definitionname}{Definition}
  \newcommand{\theoremname}{Theorem}
  \newcommand{\axiomname}{Axiom}
  \newcommand{\postulatename}{Postulate}
  \newcommand{\lemmaname}{Lemma}
  \newcommand{\propositionname}{Proposition}
  \newcommand{\corollaryname}{Corollary}
  \newcommand{\examplename}{Example}
  \newcommand{\exercisename}{Exercise}
  \newcommand{\remarkname}{Remark}
  \newcommand{\hintname}{Hint}
  \newcommand{\assumptionname}{Assumption}
  \newcommand{\conclusionname}{Conclusion}
  \newcommand{\solutionname}{Solution}
  \newcommand{\propertyname}{Property}
  \newcommand{\introductionname}{Introduction}
  % \newcommand{\problemsetname}{Exercise}
  \newcommand\bioinfo[2]{\gdef\@bioinfo{\textbf{#1}: #2}}
  \newcommand{\updatename}{Updates:}
  \newcommand{\historyname}{Version History}
}{\relax}

\ifdefstring{\ELEGANT@lang}{it}{
  % \RequirePackage[utf8]{inputenc}
  \RequirePackage[italian]{babel}
  % \RequirePackage[T1]{fontenc}
  \setlength\parindent{2em}
  \newcommand\figref[1]{\textbf{Figura}~\ref{#1}}
  \newcommand\tabref[1]{\textbf{Tabella}~\ref{#1}}
  \newcommand{\authorname}{\textbf{Autore: }}
  \newcommand{\institutename}{\textbf{Istituto: }}
  \newcommand{\datename}{\textbf{Data: }}
  \newcommand{\versionname}{\textbf{Versione: }}
  \newcommand{\notename}{Nota}
  \newcommand{\proofname}{Dimostrazione}
  \newcommand{\problemname}{Problema}
  \newcommand{\definitionname}{Definizione}
  \newcommand{\theoremname}{Teorema}
  \newcommand{\axiomname}{Assioma}
  \newcommand{\postulatename}{Postulato}
  \newcommand{\lemmaname}{Lemma}
  \newcommand{\propositionname}{Proposizione}
  \newcommand{\corollaryname}{Corollario}
  \newcommand{\examplename}{Esempio}
  \newcommand{\exercisename}{Esercizio}
  \newcommand{\remarkname}{Commento}
  \newcommand{\assumptionname}{Assunto}
  \newcommand{\conclusionname}{Conclusione}
  \newcommand{\solutionname}{Soluzione}
  \newcommand{\propertyname}{Proprietà}
  \newcommand{\introductionname}{Introduzione}
  \newcommand\bioinfo[2]{\gdef\@bioinfo{\textbf{#1}: #2}}
  \newcommand{\updatename}{Aggiornamenti:}
  \newcommand{\historyname}{Cronologia delle versioni}
}{\relax}

\ifdefstring{\ELEGANT@lang}{hu}{
  \RequirePackage[magyar]{babel}
  \setlength\parindent{2em}
  \newcommand\figref[1]{\ref{#1}~\textbf{Ábra}}
  \newcommand\tabref[1]{\ref{#1}~\textbf{Táblázat}}
  \renewcommand{\chaptername}{\thechapter ~ fejezet}
  \newcommand{\authorname}{\textbf{Szerző: }}
  \newcommand{\institutename}{\textbf{Intézmény: }}
  \newcommand{\datename}{\textbf{Dátum: }}
  \newcommand{\versionname}{\textbf{Verziószám: }}
  \bibliographystyle{\ELEGANT@bibstyle}
  \newcommand{\notename}{Jegyzet}
  \newcommand{\proofname}{Bizonyítás}
  \newcommand{\problemname}{Probléma}
  \newcommand{\definitionname}{Definíció}
  \newcommand{\theoremname}{Tétel}
  \newcommand{\axiomname}{Axióma}
  \newcommand{\postulatename}{Követelmény}
  \newcommand{\lemmaname}{Lemma}
  \newcommand{\propositionname}{Előzmény}
  \newcommand{\corollaryname}{Következmény}
  \newcommand{\examplename}{Példa}
  \newcommand{\exercisename}{Feladat}
  \newcommand{\remarkname}{Megjegyzés}
  \newcommand{\assumptionname}{Sejtés}
  \newcommand{\conclusionname}{Összefoglalás}
  \newcommand{\solutionname}{Megoldás}
  \newcommand{\propertyname}{Tulajdonság}
  \newcommand{\introductionname}{Bevezetés}
  \newcommand{\problemsetname}{Feladatok}
  \newcommand\bioinfo[2]{\gdef\@bioinfo{\textbf{#1}: #2}}
  \newcommand{\updatename}{Frissítve:}
  \newcommand{\historyname}{Korábbi verziók}
}{\relax}

\ifdefstring{\ELEGANT@lang}{nl}{
  \RequirePackage[dutch]{babel}
  \setlength\parindent{2em}
  \newcommand\figref[1]{\textbf{Figuur}~\ref{#1}}
  \newcommand\tabref[1]{\textbf{Tabel}~\ref{#1}}
  \renewcommand{\chaptername}{Hoofdstuk \arabic{chapter}}
  \newcommand{\authorname}{\textbf{Auteur: }}
  \newcommand{\institutename}{\textbf{Instituut: }}
  \newcommand{\datename}{\textbf{Datum: }}
  \newcommand{\versionname}{\textbf{Versie: }}
  \newcommand{\notename}{Opmerking}
  \newcommand{\proofname}{Bewijs}
  \newcommand{\problemname}{Probleem}
  \newcommand{\definitionname}{Definitie}
  \newcommand{\theoremname}{Stelling}
  \newcommand{\axiomname}{Uitgangspunt}
  \newcommand{\postulatename}{Hypothese}
  \newcommand{\lemmaname}{Lemma}
  \newcommand{\propositionname}{Voorstel}
  \newcommand{\corollaryname}{Gevolgtrekking}
  \newcommand{\examplename}{Voorbeeld}
  \newcommand{\exercisename}{Oefening}
  \newcommand{\remarkname}{Commentaar}
  \newcommand{\assumptionname}{Veronderstelling}
  \newcommand{\conclusionname}{Besluit}
  \newcommand{\solutionname}{Oplossing}
  \newcommand{\propertyname}{Eigenschap}
  \newcommand{\introductionname}{Introductie}
  \newcommand{\problemsetname}{Probleemcomplex}
  \newcommand\bioinfo[2]{\gdef\@bioinfo{\textbf{#1}: #2}}
  \newcommand{\updatename}{Update:}
  \newcommand{\historyname}{Versie Geschiedenis}
}{\relax}

\ifdefstring{\ELEGANT@lang}{de}{
  \setlength\parindent{2em}
  \renewcommand{\contentsname}{Inhaltsverzeichnis}
  \newcommand\figref[1]{\textbf{Figur}~\ref{#1}}
  \newcommand\tabref[1]{\textbf{Tabelle}~\ref{#1}}
  \renewcommand{\partname}{\color{structurecolor} Teil}
  \renewcommand{\listfigurename}{Abbildungsverzeichnis}
  \renewcommand{\listtablename}{Tabellenverzeichnis}
  \renewcommand{\bibname}{Bibliographie}
  \renewcommand{\appendixname}{Anhang~\thechapter}
  \renewcommand{\chaptername}{Kapitel \thechapter}
  \newcommand{\authorname}{\textbf{Autor: }}
  \newcommand{\institutename}{\textbf{Institut: }}
  \newcommand{\datename}{\textbf{Datum: }}
  \newcommand{\versionname}{\textbf{Version: }}
  \newcommand{\notename}{Notiz}
  \newcommand{\proofname}{Beweis}
  \newcommand{\problemname}{Problem}
  \newcommand{\definitionname}{Definition}
  \newcommand{\theoremname}{Theorem}
  \newcommand{\axiomname}{Axiom}
  \newcommand{\postulatename}{Postulat}
  \newcommand{\lemmaname}{Lemma}
  \newcommand{\propositionname}{Behauptung}
  \newcommand{\corollaryname}{Corollary}
  \newcommand{\examplename}{Beispiel}
  \newcommand{\instancename}{Beispiel} %
  \newcommand{\exercisename}{\"{U}bung}
  \newcommand{\remarkname}{Anmerkung}
  \newcommand{\assumptionname}{Annahme}
  \newcommand{\conclusionname}{Abschluss}
  \newcommand{\solutionname}{Aufl\"{o}sung}
  \newcommand{\propertyname}{Property}
  \newcommand{\introductionname}{Einleitung}
  \newcommand\bioinfo[2]{\gdef\@bioinfo{\textbf{#1}: #2}}
  \newcommand{\updatename}{Updates:}
  \newcommand{\historyname}{Version der Geschichte}
}{\relax}


\graphicspath{{./figure/}{./figures/}{./image/}{./images/}{./graphics/}{./graphic/}{./pictures/}{./picture/}}

\RequirePackage{tikz} %% load tikz without tikz
\usetikzlibrary{backgrounds,calc,shadows,positioning,fit}
\newcommand*\circled[1]{\tikz[baseline=(char.base)]{
            \node[shape=circle,draw,inner sep=1pt] (char) {#1};}}
%  https://tex.stackexchange.com/questions/7032/good-way-to-make-textcircled-numbers

\newcommand*{\eitemi}{\tikz \draw [baseline, ball color=structurecolor,draw=none] circle (2pt);}
\newcommand*{\eitemii}{\tikz \draw [baseline, fill=structurecolor,draw=none,circular drop shadow] circle (2pt);}
\newcommand*{\eitemiii}{\tikz \draw [baseline, fill=structurecolor,draw=none] circle (2pt);}
\setlist[enumerate,1]{label=\color{structurecolor}\arabic*., ref=\color{structurecolor}\arabic*}
\setlist[enumerate,2]{label=\color{structurecolor}(\alph*)., ref=\color{structurecolor}(\alph*)}
\setlist[enumerate,3]{label=\color{structurecolor}\Roman*., ref=\color{structurecolor}\Roman*}
\setlist[enumerate,4]{label=\color{structurecolor}\Alph*., ref=\color{structurecolor}\Alph*}
\setlist[itemize,1]{label={\eitemi}}
\setlist[itemize,2]{label={\eitemii}}
\setlist[itemize,3]{label={\eitemiii}}


%%   章节设置
\RequirePackage[center,pagestyles]{titlesec}
\RequirePackage{apptools}
\RequirePackage[toc,page,title,titletoc]{appendix}

\setcounter{secnumdepth}{5}
\newcommand{\chapterextra}{\ifdefstring{\ELEGANT@lang}{cn}{}{\thechapter\enspace}}
\titleformat{\chapter}[\style]{\bfseries}{
  \filcenter\LARGE\enspace\bfseries{\color{structurecolor} \chaptertitlename\ \chapterextra}}{1pt}{
  \LARGE\bfseries\color{structurecolor}\filcenter}[]
\titleformat{\section}[hang]{\bfseries}{
  \Large\bfseries{\color{structurecolor}\thesection}\enspace}{1pt}{%
  \color{structurecolor}\Large\bfseries\filright}
\titleformat{\subsection}[hang]{\bfseries}{
  \large\bfseries\color{structurecolor}\thesubsection\enspace}{1pt}{%
  \color{structurecolor}\large\bfseries\filright}
\titleformat{\subsubsection}[hang]{\bfseries}{
  \large\bfseries\color{structurecolor}\thesubsubsection\enspace}{1pt}{%
  \color{structurecolor}\large\bfseries\filright}


\titlespacing{\chapter}{0pt}{-20pt}{1.3\baselineskip}
%\titlespacing{\subsection}{0pt}{0.5\baselineskip}{-\baselineskip}

%%define the note and proof environment
\RequirePackage{pifont,manfnt,bbding}
\RequirePackage[many]{tcolorbox}
% \newlength{\normalparindent}
% \setlength{\normalparindent}{\parindent}
\ifdefstring{\ELEGANT@mode}{fancy}{
  \tcbset{
    common/.style={
      fontupper=\citshape,
      lower separated=false,
      % before upper={\setlength{\parindent}{\normalparindent}},
      coltitle=white,
      colback=gray!5,
      boxrule=0.5pt,
      fonttitle=\bfseries,
      enhanced,
      breakable,
      top=8pt,
      before skip=8pt,
      attach boxed title to top left={
        yshift=-0.11in,
        xshift=0.15in},
      boxed title style={
        boxrule=0pt,
        colframe=white,
        arc=0pt,
        outer arc=0pt},
      separator sign={.},},
    defstyle/.style={
      common,
      colframe=main,  
      colback=main!5,
      colbacktitle=main, 
      overlay unbroken and last={
        \node[anchor=south east, outer sep=0pt] at (\linewidth-width,0) {
          \textcolor{main}{$\clubsuit$}};}},
    thmstyle/.style={
      common,
      colframe=second,  
      colback=second!5,
      colbacktitle=second, 
      overlay unbroken and last={
        \node[anchor=south east, outer sep=0pt] at (\linewidth-width,0) {
          \textcolor{second}{$\heartsuit$}};}},
    propstyle/.style={
      common,
      colframe=third,  
      colback=third!5,
      colbacktitle=third, 
      overlay unbroken and last={
        \node[anchor=south east, outer sep=0pt] at (\linewidth-width,0) {
          \textcolor{third}{$\spadesuit$}};}},}
  % \newtcbtheorem[auto counter,number within=chapter]{definition}{\definitionname}{defstyle}{def}
  \DeclareTColorBox[auto counter,number within=chapter]{definition}{ o t\label g }{
    common,defstyle,
    IfValueTF={#1}{title={\definitionname~\thetcbcounter\ (#1)}}{title=\definitionname~\thetcbcounter},
    IfBooleanTF={#2}{label=#3}{}}
  % \newtcbtheorem[auto counter,number within=chapter]{theorem}{\theoremname}{thmstyle}{thm}
  \DeclareTColorBox[auto counter,number within=chapter]{theorem}{ o t\label g }{
    common,thmstyle,
    IfValueTF={#1}{title={\theoremname~\thetcbcounter\ (#1)}}{title=\theoremname~\thetcbcounter},
    IfBooleanTF={#2}{label=#3}{}}
  % \newtcbtheorem[auto counter,number within=chapter]{postulate}{\postulatename}{thmstyle}{pos}
  \DeclareTColorBox[auto counter,number within=chapter]{postulate}{ o t\label g }{
    common,thmstyle,
    IfValueTF={#1}{title={\postulatename~\thetcbcounter\ (#1)}}{title=\postulatename~\thetcbcounter},
    IfBooleanTF={#2}{label=#3}{}}
  % \newtcbtheorem[auto counter,number within=chapter]{axiom}{\axiomname}{thmstyle}{axi}
  \DeclareTColorBox[auto counter,number within=chapter]{axiom}{ o t\label g }{
    common,thmstyle,
    IfValueTF={#1}{title={\axiomname~\thetcbcounter\ (#1)}}{title=\axiomname~\thetcbcounter},
    IfBooleanTF={#2}{label=#3}{}}
  % \newtcbtheorem[auto counter,number within=chapter]{corollary}{\corollaryname}{thmstyle}{cor}
  \DeclareTColorBox[auto counter,number within=chapter]{corollary}{ o t\label g }{
    common,thmstyle,
    IfValueTF={#1}{title={\corollaryname~\thetcbcounter\ (#1)}}{title=\corollaryname~\thetcbcounter},
    IfBooleanTF={#2}{label=#3}{}}
  % \newtcbtheorem[auto counter,number within=chapter]{lemma}{\lemmaname}{thmstyle}{lem}
  \DeclareTColorBox[auto counter,number within=chapter]{lemma}{ o t\label g }{
    common,thmstyle,
    IfValueTF={#1}{title={\lemmaname~\thetcbcounter\ (#1)}}{title=\lemmaname~\thetcbcounter},
    IfBooleanTF={#2}{label=#3}{}}
  % \newtcbtheorem[auto counter,number within=chapter]{proposition}{\propositionname}{propstyle}{pro}
  \DeclareTColorBox[auto counter,number within=chapter]{proposition}{ o t\label g }{
    common,propstyle,
    IfValueTF={#1}{title={\propositionname~\thetcbcounter\ (#1)}}{title=\propositionname~\thetcbcounter},
    IfBooleanTF={#2}{label=#3}{}}}{\relax}


\ifdefstring{\ELEGANT@mode}{simple}{
  \let\openbox\relax
  \RequirePackage{amsthm}
  \let\proof\relax
  % \let\proofname\relax
  \let\endproof\relax

  % declare a new theorem style
  \newtheoremstyle{defstyle}{3pt}{3pt}{\citshape}{-3pt}{
    \bfseries\color{main}}{}{0.5em}{\thmname{#1} \thmnumber{#2} \thmnote{(#3)}}
  \newtheoremstyle{thmstyle}{3pt}{3pt}{\citshape}{-3pt}{
    \bfseries\color{second}}{}{0.5em}{\thmname{#1} \thmnumber{#2} \thmnote{(#3)}}
  \newtheoremstyle{prostyle}{3pt}{3pt}{\citshape}{-3pt}{
    \bfseries\color{third}}{}{0.5em}{\thmname{#1} \thmnumber{#2} \thmnote{(#3)}}


  \theoremstyle{defstyle} % definition style
  \newtheorem{definition}{\definitionname}[chapter]

  \theoremstyle{thmstyle} %theorem style
  \newtheorem{theorem}{\theoremname}[chapter]
  \newtheorem{lemma}{\lemmaname}[chapter]
  \newtheorem{corollary}{\corollaryname}[chapter]
  \newtheorem{postulate}{\postulatename}[chapter]
  \newtheorem{axiom}{\axiomname}[chapter]

  \theoremstyle{prostyle} % proposition style
  \newtheorem{proposition}{\propositionname}[chapter]
}{\relax}

% main（green-def): example exercise problem solution
% second（orange-thm）: proof note remark  
% third（blue-prop):  assumptions property conclusion custom

%% Example with counter
\newcounter{exam}[chapter]
\setcounter{exam}{0}
\renewcommand{\theexam}{\thechapter.\arabic{exam}}
\newenvironment{example}[1][]{
  \refstepcounter{exam}
  \par\noindent\textbf{\color{main}{\examplename} \theexam #1 }\rmfamily}{
  \par\ignorespacesafterend}

%% Exercise with counter
\newcounter{exer}[chapter]
\setcounter{exer}{0}
\renewcommand{\theexer}{\thechapter.\arabic{exer}}
\newenvironment{exercise}[1][]{
  \refstepcounter{exer}
  \par\noindent\makebox[-3pt][r]{
    \scriptsize\color{red!90}\HandPencilLeft\quad}
    \textbf{\color{main}{\exercisename} \theexer #1 }\rmfamily}{
    \par\ignorespacesafterend}

%% Problem with counter
\newcounter{prob}[chapter]
\setcounter{prob}{0}
\renewcommand{\theprob}{\thechapter.\arabic{prob}}
\newenvironment{problem}[1][]{
  \refstepcounter{prob}
  \par\noindent\textbf{\color{main}{\problemname} \theprob #1 }\rmfamily}{
  \par\ignorespacesafterend}

\newenvironment{note}{
  \par\noindent\makebox[-3pt][r]{
    \scriptsize\color{red!90}\textdbend\quad}
    \textbf{\color{second}\notename} \citshape}{\par}

\newenvironment{proof}{
  \par\noindent\textbf{\color{second}\proofname\;}
  \color{black!90}\cfs}{
  % \hfill$\Box$\quad
  \par}

\newenvironment{solution}{\par\noindent\textbf{\color{main}\solutionname} \citshape}{\par}
\newenvironment{remark}{\noindent\textbf{\color{second}\remarkname}}{\par}
\newenvironment{hint}{\noindent\textbf{\color{second}\hintname}}{\par}
\newenvironment{assumption}{\par\noindent\textbf{\color{third}\assumptionname} \citshape}{\par}
\newenvironment{conclusion}{\par\noindent\textbf{\color{third}\conclusionname} \citshape}{\par}
\newenvironment{property}{\par\noindent\textbf{\color{third}\propertyname} \citshape}{\par}
\newenvironment{custom}[1]{\par\noindent\textbf{\color{third} #1} \citshape}{\par}

\RequirePackage{multicol}
\tcbset{
  introductionsty/.style={
    enhanced,
    breakable,
    colback=structurecolor!10,
    colframe=structurecolor,
    fonttitle=\bfseries,
    colbacktitle=structurecolor,
    fontupper=\citshape,
    attach boxed title to top center={yshift=-3mm,yshifttext=-1mm},
    boxrule=0pt,
    toprule=0.5pt,
    bottomrule=0.5pt,
    top=8pt,
    before skip=8pt,
    sharp corners
  },
}

\newenvironment{introduction}[1][\introductionname]{
  \begin{tcolorbox}[introductionsty,title={#1}]
    \begin{multicols}{2}
      \begin{itemize}[label=\textcolor{structurecolor}{\upshape\scriptsize\SquareShadowBottomRight}]}{
      \end{itemize}
    \end{multicols}
  \end{tcolorbox}}

\RequirePackage{adforn}

\newenvironment{problemset}[1][\chaptername~\chapterextra\exercisename]{
  \begin{center}
    \phantomsection\addcontentsline{toc}{section}{\texorpdfstring{\chaptername\;\exercisename}{\exercisename}}
    % \markboth{#1}{\rightmark}
    \markright{#1}
    \textcolor{structurecolor}{\Large\bfseries\adftripleflourishleft~#1~\adftripleflourishright}
  \end{center}
  \begin{enumerate}}{
  \end{enumerate}}

\def\relsec{\endgroup start}
\def\endrelsec{end\begingroup\def \@currenvir {relsec}}

\ifdefstring{\ELEGANT@result}{noanswer}{
  \AtBeginDocument{
  \excludecomment{solution}
  \excludecomment{proof}
  \excludecomment{inline}
  }
}{\relax}


%页眉页脚
\RequirePackage{fancyhdr}
\fancyhf{}


\fancyfoot[c]{\color{structurecolor}\scriptsize\thepage}
\if@twoside
  \fancyhead[ER]{\color{structurecolor}\cnormal\leftmark}
  \fancyhead[OL]{\color{structurecolor}\cnormal\rightmark}
\else
  \fancyhead[R]{\color{structurecolor}\cnormal\rightmark}
\fi

\renewcommand{\headrule}{\color{structurecolor}\hrule width\textwidth}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{1pt}
% \renewcommand{\headrule}{}
\fancypagestyle{plain}{\renewcommand{\headrulewidth}{0pt}\fancyhf{}\renewcommand{\headrule}{}}
\renewcommand{\sectionmark}[1]{\markright{\thesection\, #1}{} }
\renewcommand{\chaptermark}[1]{\markboth{\chaptername~\chapterextra{}#1}{}}



\renewcommand*{\maketitle}{%
\hypersetup{pageanchor=false}
\pagenumbering{Alph}
\begin{titlepage}
  \newgeometry{margin = 0in}
  \parindent=0pt
  \ifdefstring{\ELEGANT@device}{normal}{
    \ifcsname @cover\endcsname
      \includegraphics[width=\linewidth]{\@cover}
    \else
      \includegraphics[width=\linewidth]{example-image}
    \fi
  }{\relax}
  \ifdefstring{\ELEGANT@device}{pad}{
    \ifcsname @cover\endcsname
      \includegraphics[trim=0 26bp 0 26bp,clip=true, width=\linewidth]{\@cover}
    \else
      \includegraphics[trim=0 26bp 0 26bp,clip=true, width=\linewidth]{example-image}
    \fi
  }{\relax}
  \setlength{\fboxsep}{0pt}
  \colorbox{second}{\makebox[\linewidth][c]{\shortstack[c]{\vspace{0.5in}}}}
  \vfill
  \vskip-2ex
  \hspace{2em}
  \parbox{0.8\textwidth}{
    \bfseries\Huge 
      \ifcsname @title\endcsname \@title \fi
    \par}
  \vfill
  \vspace{-1.0cm}
  \setstretch{2.5}
  \hspace{2.5em}
  \begin{minipage}[c]{0.67\linewidth}
    {\color{darkgray}\bfseries\Large
      \ifcsname @subtitle\endcsname\@subtitle\\[2ex]\fi}
    \color{gray}\normalsize
    {\renewcommand{\arraystretch}{0.618}
    \begin{tabular}{l}
      % \ifcsname @author\endcsname \authorname \@author\\\fi
      \ifx\@author\empty\else\authorname\cnormal\@author\\ \fi
      \ifcsname @institute\endcsname \institutename \cnormal\@institute\\ \fi
      % \ifcsname @date\endcsname  \@date\\\fi
      \ifx\@date\empty\else\datename\cnormal\@date \\ \fi
      \ifcsname @version\endcsname \cnormal\versionname\@version\\ \fi
      \ifcsname @bioinfo\endcsname \cnormal\@bioinfo\\ \fi
    \end{tabular}}
  \end{minipage}
  \begin{minipage}[c]{0.27\linewidth}
  \begin{tikzpicture}[remember picture,overlay]
    \begin{pgfonlayer}{background}
      \node[opacity=0.8,
            anchor=south east,
            outer sep=0pt,
            inner sep=0pt] at ($(current page.south east) +(-0.8in,1.5in)$) {
              \ifcsname @logo\endcsname\includegraphics[width=4.2cm]{\@logo}\fi};
    \end{pgfonlayer}
  \end{tikzpicture}
  \end{minipage}
  \vfill
  \begin{center}
    \setstretch{1.3}
    \parbox[t]{0.7\textwidth}{\centering \citshape 
      \ifcsname @extrainfo\endcsname\@extrainfo\fi}
  \end{center}
  \vfill
\end{titlepage}
\restoregeometry
\thispagestyle{empty}}



\RequirePackage{listings}
% \renewcommand{\ttdefault}{cmtt}
\lstdefinestyle{mystyle}{
  basicstyle=%
    \ttfamily
    \lst@ifdisplaystyle\small\fi
}

\lstset{basicstyle=\ttfamily,style=mystyle,breaklines=true}

\definecolor{lightgrey}{rgb}{0.9,0.9,0.9}
\definecolor{frenchplum}{RGB}{190,20,83}
\lstset{language=[LaTeX]TeX,
  texcsstyle=*\color{winered},
  numbers=none,
  mathescape,
  breaklines=true,
  keywordstyle=\color{winered},
  commentstyle=\color{gray},
  emph={elegantpaper,fontenc,fontspec,xeCJK,FiraMono,xunicode,newtxmath,figure,fig,image,img,table,itemize,enumerate,newtxtext,newtxtt,ctex,microtype,description,times,booktabs,tabular,PDFLaTeX,XeLaTeX,type1cm,BibTeX,device,color,mode,lang,amsthm,tcolorbox,titlestyle,cite,ctex,listings,base,math,scheme,toc,esint,chinesefont,amsmath,bibstyle,natbib,pgfornament},
  emphstyle={\color{frenchplum}},
  morekeywords={DeclareSymbolFont,SetSymbolFont,toprule,midrule,bottomrule,institute,version,includegraphics,setmainfont,setsansfont,setmonofont ,setCJKmainfont,setCJKsansfont,setCJKmonofont,RequirePackage,figref,tabref,email,maketitle,keywords,definecolor,extrainfo,logo,cover,subtitle,appendix,chapter,hypersetup,mainmatter,frontmatter,tableofcontents,elegantpar,heiti,kaishu,lstset,pagecolor,zhnumber,marginpar,part,equote,marginnote,bioinfo,datechange,listofchange,lvert,lastpage,songti,heiti,fangsong,setCJKfamilyfont,textbf},
  frame=single,
  tabsize=2,
  rulecolor=\color{structurecolor},
  framerule=0.2pt,
  columns=flexible,
  % backgroundcolor=\color{lightgrey}
}

\newcommand\bmmax{0}
\RequirePackage{bm}

% add the list of change history
\newcommand{\dateinfoline}[2]{
  \noindent\makebox[0pt][r]{%
  \makebox[-3em][r]{%
    \small
    \textbf{\textcolor{structurecolor}{#1}}}\;\;}%
  {\citshape\updatename\ignorespaces#2}}

\newcommand{\datechange}[2]{%
  \noindent{\makebox[\textwidth][r]{\color{structurecolor}\rule{1.15\textwidth}{.4pt}}}
  \dateinfoline{#1}{#2}
  \addcontentsline{dates}{section}{#1 -- #2}}

\newcommand{\listofchanges}{%
  \begingroup
    \renewcommand{\contentsname}{\historyname}
    \let\old@starttoc\@starttoc
    \def\@starttoc##1{
      \old@starttoc{dates}}
    \tableofcontents%
  \endgroup}
% https://tex.stackexchange.com/questions/472931/list-of-all-dates-in-a-document

\newenvironment{change}{
  \begin{enumerate}[label=\small\protect\circled{\arabic*}]}{
  \end{enumerate}}

\addbibresource[location=local]{reference.bib}

\renewcommand\tableofcontents{%
  \hypersetup{linktoc=all, linkcolor=black}
    \if@twocolumn
      \@restonecoltrue\onecolumn
    \else
      \@restonecolfalse
    \fi
    \chapter*{\contentsname
        \@mkboth{%
           \MakeUppercase\contentsname}{\MakeUppercase\contentsname}}%
    \ifdefstring{\ELEGANT@toc}{twocol}{
      \setlength{\columnsep}{2em}
      \begin{multicols}{2}%
        \@starttoc{toc}
      \end{multicols}}{
      \@starttoc{toc}}
    \if@restonecol\twocolumn\fi}


\labelformat{section}{Section~#1}
\labelformat{theorem}{定理~#1}
\labelformat{algorithm}{算法~#1}
\labelformat{exercise}{习题~#1}

\RequirePackage{pagecolor,afterpage}
\def\@part[#1]#2{%
    \newcommand*{\mylmargin}{\dimexpr\oddsidemargin+1in\relax}
    \ifnum \c@secnumdepth >-2\relax
      \refstepcounter{part}%
      \addcontentsline{toc}{part}{\thepart\hspace{1em}#1}%
    \else
      \addcontentsline{toc}{part}{#1}%
    \fi%
    {
    \centering
    \newpagecolor{structurecolor!10}\afterpage{\restorepagecolor}
    \interlinepenalty \@M
    \normalfont
    \vskip 30\p@
    \hspace{-\the\mylmargin}
    \fboxsep0pt
    \colorbox{white}{
      \begin{minipage}[c]{1.0\paperwidth}
        \centering
        \parbox{0.7\textwidth}{
          \centering
          \vspace*{1.5\baselineskip}
          \Huge\scshape\bfseries \textcolor{structurecolor}{\thepart.\; #2}
          \vspace*{0.7\baselineskip}}
      \end{minipage}}}
  \@endpart}


\renewcommand*{\cleardoublepage}{\clearpage\if@twoside \ifodd\c@page\else
\hbox{}%
\thispagestyle{empty}%
\newpage%
\if@twocolumn\hbox{}\newpage\fi\fi\fi}